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[Varche]

I got my ancient but much loved Technics Hi Fi separates out of store last night and connected it all up. It still works after over four years but I was dissapointed to find that the main speaker cones seem to have rotted away.

They are Mission 707's. I haven't got the money to replace them with new but thought they might be repairable . Has anyone done this? The speakers aren't a regular circular shape so I am guessing that they would have to come from "Mission" if they are still in business!

Any suggestions or info gratefully received.

varche  

[Marks DTM Calib]

Mission are still in buisness and do provide spares but, they only make a finite number of spares and once they are gone no more are produced.
Be warey though because if you fit a new driver to one speaker, the other will then sound flat!

[Marks DTM Calib]

These are listed as 707 repair kits...

http://cgi.ebay.co.uk/Foam-speaker-rings-surrounds-Mission-707-761-762-etc_W0QQitemZ120205617278QQihZ002QQcategoryZ112516QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem

[Varche]

Thanks Marks DTM.

I think they will do the job - the cones themselves are fine.

Funnily enough I have just done a search on Mission 707 on ebay and there is a guy selling a pair like mine with exactly the same problem. Bargain for someone with a state of the ark hi fi system with the above repair kit!!

I'll get some.

varche  

[Bo Bo]

Thanks Marks DTM.

I think they will do the job - the cones themselves are fine.

Funnily enough I have just done a search on Mission 707 on ebay and there is a guy selling a pair like mine with exactly the same problem. Bargain for someone with a state of the ark hi fi system with the above repair kit!!

I'll get some.

varche  

Not so new then  

[Martin_1962]

I had similar with a pair of Castles - they rebuilt the drivers, the foam rots

[cem_devecioglu]

Even if repair kits or new paires cant be found ,

similiar size and likely same impedance cones will do the job..

I have built many speakers for myself and friends and in case of

change (they are damaged by the children gerenally)  with similiar

impedance I dont see important difference..(if not big difference in

quality)

[MaxV6]

Even if repair kits or new paires cant be found ,

similiar size and likely same impedance cones will do the job..

I have built many speakers for myself and friends and in case of

change (they are damaged by the children gerenally)  with similiar

impedance I dont see important difference..(if not big difference in

quality)

Not all drivers are created equal, different frequency responses and efficiency ratings, not to mention whether they're designed to be used in a ported cabinet, or sealed cabinet, not to the mention power rating....

it's actually more likely that using "any old pair of drivers" will result in a speaker that doesn't sound remotely like it's designer intended, than any sort of happy accident "jackpot"

with regards to the peished 707's
Wembley loudspeakers, if they're still there, would be a good bet to get a decent repair  done ,..   haven't checked but their number was
02087434567

last time I used them.....

[cem_devecioglu]

Even if repair kits or new paires cant be found ,

similiar size and likely same impedance cones will do the job..

I have built many speakers for myself and friends and in case of

change (they are damaged by the children gerenally)  with similiar

impedance I dont see important difference..(if not big difference in

quality)

Not all drivers are created equal, different frequency responses and efficiency ratings, not to mention whether they're designed to be used in a ported cabinet, or sealed cabinet, not to the mention power rating....
it's actually more likely that using "any old pair of drivers" will result in a speaker that doesn't sound remotely like it's designer intended, than any sort of happy accident "jackpot"

with regards to the peished 707's
Wembley loudspeakers, if they're still there, would be a good bet to get a decent repair  done ,..   haven't checked but their number was
02087434567

last time I used them.....

Nowadays there are many kind of bass speakers , tweeters and mid range cones ..I think it will be easy to find one that suits the need..

and can be better also as it will have new technology..

ps: arrangement in cross over filter will give much better results..

[MaxV6]

Even if repair kits or new paires cant be found ,

similiar size and likely same impedance cones will do the job..

I have built many speakers for myself and friends and in case of

change (they are damaged by the children gerenally)  with similiar

impedance I dont see important difference..(if not big difference in

quality)

Not all drivers are created equal, different frequency responses and efficiency ratings, not to mention whether they're designed to be used in a ported cabinet, or sealed cabinet, not to the mention power rating....
it's actually more likely that using "any old pair of drivers" will result in a speaker that doesn't sound remotely like it's designer intended, than any sort of happy accident "jackpot"

with regards to the peished 707's
Wembley loudspeakers, if they're still there, would be a good bet to get a decent repair  done ,..   haven't checked but their number was
02087434567

last time I used them.....

Nowadays there are many kind of bass speakers , tweeters and mid range cones ..I think it will be easy to find one that suits the need..

and can be better also as it will have new technology..

ps: arrangement in cross over filter will give much better results..

I could list several thousand different drivers....

"easy to find"

not unless you know what the numbers associated with each one in terms of it's specification actually mean...   and most people definitely don't....

(I'm an audio engineer by trade.... so it's my little corner of complete geekdom , but my excuse is it's my job....    )


Oh, and new doesn't automatically mean better, often it's just different....

the essential physics of building a driver hasn't changed...  only some of the materials...   the core technology is identical to the way it's always been....    Magnet + coil + variable current = movement.

[Marks DTM Calib]

Even if repair kits or new paires cant be found ,

similiar size and likely same impedance cones will do the job..

I have built many speakers for myself and friends and in case of

change (they are damaged by the children gerenally)  with similiar

impedance I dont see important difference..(if not big difference in

quality)

Speaker design is a detailed process and very itterative...

You start by deciding on size, port/no port, number of ports, application etc as per your target market.....you then select a driver to suit the target design.....more often than not you will then tweak the cabinet design or even the driver to enhance things.....

Getting a good match for a main stream setup by the likes of Mission will be a tough process, your only real chance is a new driver from Mission directly (I bet its been tweaked so will be a special)

But, here budget is a key consideration and hence the repair kits (which are actualy pretty simple and reliable to fit) although these will probably have a different compliance to the origianls!

[cem_devecioglu]

Even if repair kits or new paires cant be found ,

similiar size and likely same impedance cones will do the job..

I have built many speakers for myself and friends and in case of

change (they are damaged by the children gerenally)  with similiar

impedance I dont see important difference..(if not big difference in

quality)

Not all drivers are created equal, different frequency responses and efficiency ratings, not to mention whether they're designed to be used in a ported cabinet, or sealed cabinet, not to the mention power rating....
it's actually more likely that using "any old pair of drivers" will result in a speaker that doesn't sound remotely like it's designer intended, than any sort of happy accident "jackpot"

with regards to the peished 707's
Wembley loudspeakers, if they're still there, would be a good bet to get a decent repair  done ,..   haven't checked but their number was
02087434567

last time I used them.....

Nowadays there are many kind of bass speakers , tweeters and mid range cones ..I think it will be easy to find one that suits the need..

and can be better also as it will have new technology..

ps: arrangement in cross over filter will give much better results..

I could list several thousand different drivers....

"easy to find"

not unless you know what the numbers associated with each one in terms of it's specification actually mean...   and most people definitely don't....

(I'm an audio engineer by trade.... so it's my little corner of complete geekdom , but my excuse is it's my job....    )


Oh, and new doesn't automatically mean better, often it's just different....

the essential physics of building a driver hasn't changed...  only some of the materials...   the core technology is identical to the way it's always been....    Magnet + coil + variable current = movement.

Not every music listener is audio enginner and I believe wont be sensitive as some  

[cem_devecioglu]

Even if repair kits or new paires cant be found ,

similiar size and likely same impedance cones will do the job..

I have built many speakers for myself and friends and in case of

change (they are damaged by the children gerenally)  with similiar

impedance I dont see important difference..(if not big difference in

quality)

Speaker design is a detailed process and very itterative...

You start by deciding on size, port/no port, number of ports, application etc as per your target market.....you then select a driver to suit the target design.....more often than not you will then tweak the cabinet design or even the driver to enhance things.....

Getting a good match for a main stream setup by the likes of Mission will be a tough process, your only real chance is a new driver from Mission directly (I bet its been tweaked so will be a special)

But, here budget is a key consideration and hence the repair kits (which are actualy pretty simple and reliable to fit) although these will probably have a different compliance to the origianls!

I said "if repair kits or similiar not available"..

and by the way I dont think these speakers are magic or come

down from the sky.. I see many expensive speakers (really good

brand) beaten by simple set ups..

[cem_devecioglu]

here is a funny example  

http://www.youtube.com/watch?v=mPZ9UsOr-JY



http://www.metacafe.com/watch/719200/homemade_speakers

[wakeyomega]

personally I tend to agree with Cem - if only my 57 year old ears where any where near as good as the specs of some expensive speakers it may be worth the money!